Ah, the offset holes thing...Yeah, there aren't a lot of ASAs out there with offset holes anymore, but there are those blocks that Sandman mentioned.
Also, if you can find a rail or a small drop with those holes, then you can put any other type of ASA on there.

Or you can drill out the drop/rail like I did and mount it to your stock gripframe. I had to use different bolts and thus different square nuts inside the frame.